Please, don't use a cornice as a doorstop. At least put it somewhere where people will have to look up at it. Architectural details really ought to be displayed in the same relation to the viewer as they were originally intended.
The South Africans decided that they would like to prove to the world they did not have any nuclear weapons and their decision was not doubted because it was the end of the Cold War, it was also the end of apartheid.